The street names are about twice as long but smaller (more condensed). The navi information is shown slightly different, but basically the same information. I don't have a picture from a turn but it's now red on white, easier to identify where to go. The check system looks nicer too, with animated symbols and a green OK.
When I first got in the car I wasn't 100% sure if it was worth the money. It's not clear from the pictures (mine and all the others I have seen) but the resolution is not like I'm used to from a SVGA+ laptop. if you have ever seen a Treo 600 and Treo 650 next to each other, I would say the color DIS is the 600 and the laptop display is a 650. You can see the pixels but I would still say I'm 90% satisfied.
The main differenceis that it looks now like the next generation from the inside. All red was nice in the B5, red with white scales was nice in the B6, but all white with only the important stuff in red is definitely B7 and enough for the next 3 years until the B8 appears.
I would recommend to test drive a B7 with the navi and make up your mind. It's a lot money, but some pay the same just for a couple more hp or some 10th of a second faster 0-60. I'm fine with how it is now and I really like it.
Check my picture poster on AW, there are some before and after pictures posted. I'm gonna try to get some better pictures which show the resolution better and are sharper (still have to figure out how this camera works).